Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
  • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
  • B66C23/54—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with pneumatic or hydraulic motors, e.g. for actuating jib-cranes on tractors

Definitions

• the present invention relates to a hydraulic crane. More particularly, the invention relates to a hydraulic crane of the kind comprising a crane base, a centre post, which is rotatably mounted in the crane base for rotation around an at least approximately vertical axis and connected to a hydraulic rotary device, by which it may?
• a crane boom which is pivotally attached to the centre post and composed of at least two pivotally interconnected sections, which may be swung relatively to each other and relatively to the centre post around mutually parallel, at least approximately horizontal pivot axes and which are connected to hydraulic means, by which they may be moved to and held in different pivotal positions
• a lifting fork which is carried by the outermost crane boom section and which is pivotally and rotatably connected to said crane boom section by means of a bearing housing, pivotally connected to the outermost crane boom section for pivoting movement relatively to said crane boom section around an axis parallel to the aforesaid pivot axes, and a supporting shaft, which is rotatably mounted in said bearing housing and extends in a direction perpendicul to the pivot axis of said bearing housing and which is connected to a hydraulic rotary device, by which it may be moved to and held in different rotary positions relative ly to the bearing housing.
• a hydraulic crane of said kind is previously known through DE-Al 28 02 Oil.
• this known crane is intended to be used for loading goods supported on pallets, or other similar goods, on to trucks or other goods transporta ⁇ tion vehicles and unloading it from such vehicles.
• the crane may in this connection be mounted on the vehicle in question. However, it may also be mounted on a stationary foundation, such as a stationary loading platform at a goods terminal.
• each drane boom section is formed by a parallelogram linkage comprising two parallel elongate link members which, at both ends thereof, are connected to each other by means of short connecting links.
• the connecting link lo ⁇ ated at the outer end of the outermost crane boom section is formed by the bearing housing for the supporting shaft of the lifting fork.
• the invention has for its object to provide an improved hydraulic crane of the kind initially specified which eliminates the above mentioned disadvantages of the known crane.
• a hydraulic crane of said kind primarily characterized in that the pivotal position of the bearing housing relatively to the outermost crane boom section is separately adjustable by means of a hydraulic means, connected between the bearing housing and said crane boom section, and that the lifting fork is tiltably connected to the supporting shaft for limited tilting movement relatively to said shaft around a tilting axis, perpendicular to the supporting shaft- and connected to a hydralic means, by which it may be moved to and held in different tilting positions.
• the hydraulic crane proposed according to the invention is well suited for different tasks requiring the crane to be highly flexible.
• the proposed crane is especially intended to be used for loading goods supported on pallets, or similar goods, on to a truck or other goods transportation vehicle from one or the other of the two long sides of said vehicle.
• the crane boom may suitably comprise at least three successive sections, which are pivotally connected to each other.
• the outermost crane boom section may preferably be telescopically extensible and comprise an inner portion, pivotally connected to the adjacent crane boom section, and an outer portion which is displaceably mounted in said inner • portion and carries the lifting fork at its outer end.
• the crane base may suitably be mounted on a slide, which is mounted for rectilinear displacement in an approximately horizontal direction along a first elongate guide member, which, in its turn, is mounted longitudinally displaceable along a second elongate guide member, intended to be mounted in a transversal direction on a goods transportation vehicle, adjacent to a goods space of said vehicle, hydraulic means being provided both for moving the slide along the first guide member and holding it in set position therealong and for moving the first guide member along the second guide member and holding it in set position along the latter guide member.
• the two guide members and the slide carried thereby may be utilized as an extensible crane bridge which may be caused to project externally of the vehicle, in a lateral direction therefrom, and by which the crane may be moved between a retracted parkint position, in which, upon folding-up the crane boom, it may be stored located in full within the outer sides of the vehicle, and at least one working position, in which the/ ' crane is located externally of the vehicle, on one side thereof, and can be utilized for loading goods on to the vehicle and unloading goods therefrom.
• an extensible crane bridge which may be caused to project externally of the vehicle, in a lateral direction therefrom, and by which the crane may be moved between a retracted parkint position, in which, upon folding-up the crane boom, it may be stored located in full within the outer sides of the vehicle, and at least one working position, in which the/ ' crane is located externally of the vehicle, on one side thereof, and can be utilized for loading goods on to the vehicle and unloading goods therefrom.
• Each one of the two guide members may suitably have the general shape of an elongate hollow profile member having a longitudinal upwardly facing opening, and the first guide member may be mounted longitudinal ⁇ ly displaceable within the second guide member, while the slide is mounted longitudinally displaceable within the first guide member.
• the upwardly facing longitudinal openings of the two guide members may together define a longitudinal free passage for the crane base or an upper portion of the slide serving to support the crane base.
• Figure 1 shows a side elevation view of a hydraulic crane according to an embodiment of the invention, selected by way of example, the crane, which is supported on a telescopic crane bridge mounted in transversal direction on a truck, being located in a working position externally of the goods space of the truck, at one side thereof, while
• FIG. 2 shows a longitudinal side elevation, partly in section, of said crane bridge, illustrating the crane bridge in a position in which it projects externally of the truck, at one side thereof
• Figure 3 shows an end view of the crane bridge, in section taken along line III-III in Figure 2.
• reference numeral 10 generally designates a hydraulic crane comprising a crane base 11, a centre post 12, rotatably mounted in said crane base, and a crane boom 13, which is pivotally attached to the centre post and which is composed of three pivotally interconnected sections 14, 15 and 16.
• Crane base 11 is mounted horizontally displaceable on a truck 18 by means of a telescopic crane bridge, generally designated 17, which is mounted in a transversal ' direction on truck 18 forwardly of a goods space 19 of the latter.
• Crane bridge 17 is shown more in detail in Figures 2 and 3.
• Reference numeral 20 designates a hydraulic rotary device which has been built-in in crane base 11 and by which centre post 12 may be rotated relatively to crane base 11 around an at least approximately vertical rotary axis 21, illustrated by a dash-dotted line.
• Crane boom sections 14, 15 and 16 which'are pivotally con ⁇ nected to each other and to centre post 12 by means of mutually parallel, approximately horizontal pivot pins
• the outermost crane boom section 16 is made tele- scopically extensible and comprises on the one hand an inner portion 16A, pivotally connected to the inter ⁇ mediate crane boom section 15, and on the other hand an outer portion 16B, which is mounted telescopically displaceable in said inner portion.
• a hydraulic cylinder 28 connected between inner portion 16A and outer portion 16B.
• crane boom section 16 carries a lifting fork, generally designated 29, which is pivotally and rotatably mounted on said crane boom section. Said lifting fork is mounted on crane boom section 16 through the intermediary of a bearing housing 30 and a supporting shaft 31.
• Bearing housing 30 is pivotally connected to crane boom sec ⁇ tion 16 by means of two diametrically opposite laterally projecting pivot pins 32, which define a pivot axis for bearing housing 30 extending parallel to pivot pins 22, 23 and 24.
• Reference numeral 33 designates a hydraulic cylinder which is connected between outer portion 16B of crane boom section 16 and bearing housing 30, and by which bearing housing 30 may be moved to and held in different pivotal positions relatively to crane boom section 16.
• Supporting shaft 31 is rotatably mounted in bearing housing 30 for rotation relatively to the bearing housing around a rotary axis perpendicular to the pivot axis defined by pivot pins 32.
• Reference nu ⁇ eral 34 designates a hydraulic rotary device which is mounted on bea'ring housing 30, and by which support shaft 31 may be moved to and held in different rotary positions.
• said rotary device 34 has been diagramatically shown mounted on top of bearing housing 30. In this case, it may be directly connected to supporting shaft 31. However, the rotary device 34 may instead be mounted at one side of bearing housing 30, in which case it may be connected to an upper end portion of supporting shaft 31, projecting above the bearing housing, by means of a chain trans ⁇ mission or similar means.
• Lifting fork 29 comprises two parallel supporting arms 35 which are rigidly secured to a transversal back portion 36 of the lifting fork at their rear ends.
• This back portion 36 is provided with two flanges 37 which are pivotally connected to a lower portion of supporting shaft 31, projecting from the lower end of bearing housing 30, by means of pivot pins 38, projecting from opposite sides of the supporting shaft and defining a tilting axis which extends perpendicular to the supporting shaft 31 and around which lifting fork 29 may effect a limited tilting movement.
• Reference numeral 39 designates a hydraulic cylinder, connected between supporting shaft 31 and lifting fork 29 to permit the lifting fork to be moved to and held in different tilting positions.
• crane 10 When, as shown in Figure 1, crane 10 is in a working position externally of truck 18, at one side thereof, it may be utilized for effecting a rapid and convenient loading of goods on pallets into goods space 19 from said side of the truck.
• said space has been shown divided into four different compartments. Further ⁇ more, a number of load pallets 40 have been shown resting on the bottom of some of said compartments.
• Below crane bridge 17 will be described more in detail.
• it comprises a slide 41 serving to support crane base 11 and formed as a hollow profile member having a generally rectangular cross-section and a comparatively short length. Crane base 11 is rigidly secured on top of slide 41.
• crane bridge 17 also comprises a first elongate guide member 42, within which slide 41 is mounted longitudinal ⁇ ly displaceable through the intermediary of bearing lining elements 43, and a second elongate guide member 44, within which the first guide member 42 is mounted longitudinally displaceable through the intermediary of bearing lining elements 45.
• brackets 46 the second guide member 44 is rigidly mounted in a transversal direction on truck 18 on the forward side of goods space 19.
• Each one of the two guide members 42 and 44 has the shape of an elongate hollow profile member of generally rectangular cross-section, which is provided with a longitudinal opening 47 and 48, respectively, in its upper side.
• the two openings 47 and 48 are located in alignment with each other and serve to define a longitu ⁇ dinal free passage for the lower portion of crane base 11, which is mounted on slide 41.
• the moveable guide member 42 may be moved in longi ⁇ tudinal direction within the fixed guide member 44 and held in set position relatively to the latter by means of a hydraulic cylinder 49.
• a hydraulic driving means consisting of a hydraulic motor 51, which is mounted on an inner vertical stiffening wall 50 of the slide and which is provided with two coaxial chain wheels 52 on its output shaft, and a double roller chain 54, passing over said chain wheels 52 and two pairs of pulley wheels 53.
• Said chain 54 extends within guide member 42 in the longi ⁇ tudinal direction of said member and, at its ends, it is secured to two opposite end walls 55 of guide member 42 by means of two chain holders 56.
• a hydraulic locking device 57 mounted on wall 50 and provided with an extendable locking pin 58.
• said pin 58 may be pushed into aligned openings in slide 41, guide member 42 and possible also in guide member 44.
• Crane bridge 17 may be constructed so as to permit crane 10 to be used for loading and unloading goods only from one side of the truck 18 or from both sides thereof. Further, by means of crane bridge 17, crane 10 may be moved from its working position shown in Figure 1, in which it is located externally of the vehicle, at one side thereof, into a retracted parking position in which, upon folding-up crane boom 13, it may be stored in full within the outer sides of the vehicle.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Jib Cranes (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=20361344

Family Applications (1)

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• 1985
  • 1985-09-11 SE SE8504199A patent/SE456573B/sv not_active IP Right Cessation
• 1986
  • 1986-09-10 GB GB8708455A patent/GB2193945B/en not_active Expired
  • 1986-09-10 EP EP86905965A patent/EP0236472A1/en active Pending
  • 1986-09-10 DE DE19863690487 patent/DE3690487T1/de not_active Withdrawn
  • 1986-09-10 NL NL8620369A patent/NL8620369A/nl unknown
  • 1986-09-10 WO PCT/SE1986/000402 patent/WO1987001684A1/en active Application Filing
• 1987
  • 1987-04-29 FI FI871905A patent/FI871905A0/fi not_active IP Right Cessation

Non-Patent Citations (1)

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